Circuit Lake

Electronic Project and Circuit Collection

Analog Related Resources


Low Cost Hearing Aid, TDA2822M

May 28, 2013 By: admin Category: Analog, Audio, Miscellaneous No Comments →

DIY Electronics hearing Aid

This Low Cost Hearing Aid project is built based on TDA2822M IC. This general-purpose electronic hearing aid needs 3V DC (2×1.5V battery) to works. Use an 8-pin DIP IC socket for TDA2822M for easy assembling and maintenance. Simple & Low cost hearing Aid Schematic

Single Li-Ion / Li-Polymer Battery Charger

January 23, 2013 By: admin Category: Analog, Basic No Comments →

MCP73837-based Battery Charger

The MCP73837 and MCP73838 based charger is suitable for portable applications. It is fully integrated linear Li-Ion / Li-Polymer battery chargers with autonomous power source selection. It has small physical size and only need low number of external components to make it works. The MCP73837 support Power-Good Monitor while MCP73838 has Timer Enable feature.


Simple EMF Probe Using INA122

October 17, 2012 By: admin Category: Analog, Detector, Sensor No Comments →

simple EMF detector

This simple circuit is used to detect variations in electromagnetic fields around us. It based on an instrumentation amplifier INA122 for Texas instrument. As sensing element, the detector is equipped with Inductor (100uH-1mH). The output is routed out to oscilloscope through a BNC connector. A 9v battery is used to power the circuit.

Laptop Audio Amplifier, LA4440

October 12, 2012 By: admin Category: Analog, Audio No Comments →

Notebook Audio Amplifier schematic diagram

If you want to make your laptop/notebook sound louder, you can add simple Audio Amplifier like this project. Built based on IC LA 4440, the amplifier only need few passive components. This dual channel audio power amplifier has low distortion over a wide range of low to high frequencies with good channel separation. Its built-in […]